Fen Bilimleri Enstitüsü: Recent submissions

  • Ionization energies of small atoms by momentum space electrostatics 
    Ülker, Soydaner. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    To calculate ionization energies, a method which uses momentum space techniques for electrostatic problems is described. With this method, a total of fty ve ionization energies of the rst ten elements in the periodic ...
  • Measurement of physical and optical properties of thin films with an ellipsometric technique 
    Ertuğrul, Emine. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    In this thesis, working mechanism of ellipsometer is studied in details. Thickness and refractive index of polyethyleneglycol(PEG), gold and silicon dioxide lms are measured using an elipsometer. PEG is attached to a gold ...
  • A study on the stability of the led gain monitoring system for the CMS-HF PMTs during 2009 
    Özbek, Melih. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    The Hadronic Forward (HF) calorimeter improves the jet detection and the missing transverse energy resolution of the Compact Muon Solenoid (CMS). In HF, the Photo Multiplier Tubes (PMTs) convert optical signals (i.e., ...
  • Mechanically exfoliated single and multilayer graphene sheets and graphene field effect transistor 
    Manukyan, Selin. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Graphene is a single layer of graphite sheet; one atom thick sp2-bonded carbon atoms organized on a plane. It has extremely interesting electrical properties, which o ers various applications in a number of nanometer scale ...
  • Nonperturbative aspects of quantum field theories 
    Kaynak, Burak Tevfik. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The main focus of this thesis is to elaborate rather unorthodox methods throughout a diverse range of mathematical techniques, which allow us to study quantum field theoretical models in a nonperturbative context. The ...
  • Dynamical structure analysis of five binary galaxy clusters observed with XMM-Newton x-ray observatory 
    Beygu, Burcu. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Clusters of galaxies are thought to form by accretion of galaxies along the cosmic filaments, and merging of clusters formed earlier. Observations and hydrodynamic simulations show the strong effects of mergers on physical ...
  • Solar axion production and detection mechanisms 
    Özuğurel, Umut Deniz. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Production mechanisms of the axion particle in the Sun as well as the detection principle and the data analysis methods that the CAST experiment is based on are reviewed. It is shown that the solar axion production can be ...
  • Coherence and wavelength effects on the growth mechanism of porous silicon nano-structures 
    Saygılı, Aslı Çakır. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this study, the objective is first to produce regular porous silicon(PS) nanostructures and then to observe the effects of wavelength and coherence length of the light, which is used for illumination, on the growth ...
  • The braided algebra and its Jordan-Schwinger construction in terms of Q-deformed fermionic oscillators 
    Halıcılar, Fulya. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The standard bosonic and fermionic Jordan-Schwinger constructions for the Lie algebra of SU(2) are reviewed in this thesis. It is shown that the Jordan-Schwinger constructions of the quantum group with q as deformation ...
  • Aspects of string thermodynamics 
    Arslanargın, Ayşe. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this thesis, we study thermodynamics of closed strings and open strings on D-branes in the microcanonical ensemble. Both single string and multi-string density of states are obtained from energy spectrum. In the ...
  • Gauge theories based on quantum groups, representations of the braid group 
    Yıldız, Ali. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1993., 1993.)
    Possible formulations of gauge field models where the gauge group is a quantum group are discussed. The exponential map from the generators of the Lie algebra analog of the quantum group SUq(2) to the quantum group SUq(2) ...
  • Fluorescence lifetime images of dye molecules 
    Altundal, Yücel. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this thesis, Fluorescence Lifetime Images of perylene and bodipy dye molecules mixture are studied using a time-correlated single photon-counting technique. Lifetimes of dye molecules are calculated pixel-by-pixel from ...
  • Improvement of calorimeter-based muon identification and its application to H → ZZ(*) → 4ℓ analysis in the ATLAS experiment 
    Schmidt, Nesliha Becerici. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Outermost part of the ATLAS detector, the muon spectrometer, is dedicated for detection of muons and measurement of their properties. However, combining the measurements from other parts of the detector with muon spectrometer ...
  • The relations between the x-ray spectral parameters of gamma-ray bursts 
    Kilerci, Ece. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Gamma-Ray Bursts (GRBs) are the most energetic explosions in the universe. They are thought to arise from massive stellar explosions or mergers of compact objects. As a result of these processes a black hole and an acretion ...
  • Prime statistics in particle algebras 
    Erol, Cem. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The importance of the fermion algebra extends to all branches of physics. It is characterized by the important property that at most one particle can be present in a quantum state with otherwise same quantum numbers. In ...
  • Dark energy problem and possible solutions 
    Çamlıbel, Ali Kazım. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The end of the twentieth century is marked by a revolutionary discovery in cosmology: The expansion of the universe is accelerating, as revealed by measurements of type Ia supernovae at z 1. This most likely means that ...
  • Uncertainty and certainty relations for the q-oscillator 
    Türkmen, Fatma Nur. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The uncertainty and certainty relations for the momentum and position operators for the q-oscillator and Fibonacci oscillator are investigated in this thesis. The onedimensional q-oscillator, the two-dimensional q-oscillator ...
  • A study of anomalous events in CMS-HF PMTs 
    Halu, Arda. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The Forward Hadronic (HF) calorimeter of the CMS detector will measure the hadronic jets as well as determine the missing transverse energy generally attributed to new physics phenomena. HF is a quartz ber calorimeter in ...
  • Detection of optical frequencies of metal-oxide-metal junctions 
    Yanardağ, Sırma Başak. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    In this thesis, optoelectronic characteristics of metal-oxide-metal junctions are investigated. The junctions are made of aluminum. The detected current in the Al ¡ Al2O3¡Al films is due to a quantum mechanical phenomena; ...
  • Can hyperbolic phase of Brans-Dicke field account for dark matter and dark energy? 
    Çifter, Fulya. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2008., 2008.)
    The main purpose of this thesis is to explain the dark matter and dark energy contribution to standard Friedmann Equation which relates the expansion rate of the universe, H; to the various fractions of the present energy ...